From: Stefan Rusterholz <apeiros@...>
Date: 2007-10-22T22:24:35+09:00
Subject: Re: Conflicts between using respond_to? and extending Ruby

Trans wrote:
>   respond_to?(:meta, OpenURI::Meta)

I'm sorry, but that looks just so wrong to me. Take the case on .each. 
You don't test if an object respond_to?(:each, Enumerable), you just 
need the .each.
I don't think there's a solution to the problem as you sacrifice one or 
the other thing. You can't know by the name of a method whether it does 
what you want or not. So either you jump into the cold water and assume 
it does or you sacrifice flexibility and test if it's derived from 
something you know.

Regards
Stefan
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